<template>
    <div class="login_container">
        <pre v-text="$attrs"/>
        <div class="login_box">
          <div class="avatar_box">
            <img src="../../assets/logo.png" alt="">
          </div>
          <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form">
            <el-form-item prop="username">
              <el-input v-model="loginForm.username" prefix-icon="el-icon-user" placeholder="用户名"></el-input>
             </el-form-item>
             <el-form-item prop="password">
              <el-input type="password" v-model="loginForm.password" prop="password" prefix-icon="el-icon-lock" placeholder="密码"></el-input>
             </el-form-item>
             <el-form-item class="btns">
              <el-button type="primary" @click="loginForm_login">登录</el-button>
              <el-button type="info" @click="loginForm_reset">重置</el-button>
             </el-form-item>
          </el-form>
        </div>
    </div>
</template>

<script>
    export default {
        props: {
        },
        data() {
          return {
            // 这是登录表单的数据绑定对象
            loginForm: {
              username: '',
              password: ''
            },
            loginFormRules: {
              username: [
                { required: true, message: '请输入用户名', trigger: 'blur' },
                { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
              ],
              password: [
                { required: true, message: '请输入密码', trigger: 'blur' },
                { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
              ]
            }
          }
        },
        methods: {
          loginForm_reset() {
            this.$refs.loginFormRef.resetFields();
          },
          loginForm_login() {
          //validate函数接受一个匿名的异步嵌套回调函数，valid是回调函数的参数
            this.$refs.loginFormRef.validate( async (valid) => {
              if (!valid) return;
              //校验成功用axios发送post请求,login为地址
              const { data: res } = await this.$http.post("login", this.loginForm);
              if (res.meta.status !== 200) return this.$message.error("登录失败");
              this.$message.success("登录成功");
              //将登录成功后的toke保存到sessionStorage中
              window.sessionStorage.setItem("token", res.data.token);
              //调转到主页
              this.$router.push("/home");
            });
          }
        },
    };
</script>

<style lang="less" scoped>

.login_container{
  background-color: #2b4b6b;
  height: 100%;
}

.login_box{
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}

.btns {
  display: flex;
  justify-content: flex-end;
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>
